<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
	.red{
		color:red;
	}
	.blue{
		color:blue;
	}
	/* 
		d1.className="red";
       "red" 
       
       */
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<div id="d1">情深深雨蒙蒙</div>
</body>
</html>